I prefer dual differential design to CFB design. Additional, I have no high power need
Have you ever view this design ? http://www.littlefishbicycles.com/poweramp/index.html
There is the only stage which is not diffential one. So I guess that it sounds very "detaily", "clean"

Shariar,
For me the question is: does that complexity buy you anything in terms of performance? What do you get above say a blameless amplifier?
In trying to answer your questions on the Gigant I have learnt about Accuphase circuits for which I thank you. But you pose a difficult question.

The Titan (=Gigant) was CFB - I read the original article and they discussed this point in some depth.

If its 30watts you want, go for the simpler VFB design. I doubt that the difference in slew rates will take the enjoyment out of your music!

Be warned - Elektor designs always had good measurements . . . but I think they sailed close to the wind in terms of phase margin so there have been many stories about instability - some people have no probems, others have problems. By the way, on the Titan, the article warned about sticking to the construction details strictly to avoid instability problems.

Hi Thanh,
Nice 2 see you in this thread. Do you remember me??
I'm so curios about you. And really amazing to see your posts.
I came across your post in choosing a suitable design to build. I have some points here. Did you hear some body tell about Amp sound is determined by the components( transistors, OP, signal track capacitors). I found it right in my situation. I have made a Symasym amp with 4 range of power trans and they sound differently:
Power rail: +/-52V
- 2pair of 2sb688;D718/a channel ; bass a little bit loose
- 2pair of 2sc3281 and its counter part/a channel: better bass
- 2pair of Genuine Toshiba 2sc5200 - 2sa1943/ a channel: Clean and clear sound, firm bass
- 2sc2922-2sa1216 firmest bass of all.
I have test all these with classical music and the sound is good enough. I have made 4 variants of symasym and found this design good.

Also I have built some amp with destroyer X amplifier design and found it's nice with genuine parts. An amp with +/- 50V rails 2x10,000mf capacitor and a pair of 2sc5200+2sa1943 drive a 600w (dual 10" woofers) speaker shake my coffee cup. Very impressive

Did you have a look at some Rotel design. I have find a very interesting thing in their design that makes quality.

Now I have a try on a more differential approach and did not find a clue yet. Surely, there will be some more oscillation to cope with. I will tell you when I find smt.

Hi Thanh,
Nice 2 see you in this thread. Do you remember me??
I'm so curios about you. And really amazing to see your posts.
I came across your post in choosing a suitable design to build. I have some points here. Did you hear some body tell about Amp sound is determined by the components( transistors, OP, signal track capacitors). I found it right in my situation. I have made a Symasym amp with 4 range of power trans and they sound differently:
Power rail: +/-52V
- 2pair of 2sb688;D718/a channel ; bass a little bit loose
- 2pair of 2sc3281 and its counter part/a channel: better bass
- 2pair of Genuine Toshiba 2sc5200 - 2sa1943/ a channel: Clean and clear sound, firm bass
- 2sc2922-2sa1216 firmest bass of all.
I have test all these with classical music and the sound is good enough. I have made 4 variants of symasym and found this design good.

Also I have built some amp with destroyer X amplifier design and found it's nice with genuine parts. An amp with +/- 50V rails 2x10,000mf capacitor and a pair of 2sc5200+2sa1943 drive a 600w (dual 10" woofers) speaker shake my coffee cup. Very impressive

Did you have a look at some Rotel design. I have find a very interesting thing in their design that makes quality.

Now I have a try on a more differential approach and did not find a clue yet. Surely, there will be some more oscillation to cope with. I will tell you when I find smt.

Further more, you are refering to a mosfet amp. I notice that fets are not OK with linearity, especially mosfet. They are not prescribe for audio amp until recently. You will have to choose carefully which type to use.